Annuity loan question s

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*Hello, Can somebody help? I've to make the following function:

Find the monthly payment for a 30-year loan of $30.000 with an annual interest rate of 5,5%. The function should start with:
Function monthlypayment = annuity (presentvalue, annual interest, years)
Keep those the following things in mind:
- the interest rate won't change
- the montly interest is 1/12 of the annual interest
The function should produce a monthly amount of money and has to be negative.
Calculate the monthly factor as follows:
a = 1 + (0,01*p/12)
p is the annual interest*